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Managing multiple Docker containers in a single host machine through a single command line can become tough. Hence, it’s better to know the Docker commands to manage containers the best possible way. Docker provides us with many command line tools and utilities to manage containers. In this article, we will discuss how to list Docker containers through multiple ways. We will also look at how to filter the list output to get the desired results. Listing Docker Containers Predominantly, there are two major commands that you can use to display a list of all containers − ... Read More
Supervisor mode (also called privileged mode or kernel mode) is a computer system execution mode in which the processor can execute all instructions, including privileged instructions. These special instructions include interrupt management, I/O operations, memory management, and system configuration commands that are restricted from normal user programs. The privilege levels of different components in a system form a hierarchical structure − System Privilege Levels Kernel Mode (Ring 0) Highest Privilege Device Drivers (Ring 1-2) Limited Privilege ... Read More
System logging is a critical aspect of IT infrastructure management, and Syslog servers play a significant role in the process. Syslog servers are responsible for collecting and storing log messages generated by various network devices and servers. These log messages contain vital information about the network's security, performance, and stability, and they help administrators detect, diagnose, and resolve issues. Syslog Architecture Network Devices Applications System Logs Security Events ... Read More
The LAMP stack, which stands for Linux, Apache, MySQL/MariaDB, and PHP/Perl/Python, is a popular web application development and hosting environment. Installing LAMP on a Debian 11 (Bullseye) system is a straightforward process that involves installing and configuring individual components. In this article, we will go through the step-by-step process of installing and configuring LAMP on a Debian 11 (Bullseye) system. Step 1: Update and Upgrade Your System Before installing LAMP on your Debian 11 (Bullseye) system, it is important to update and upgrade your system to ensure that you have the latest software packages and security patches. You ... Read More
Dual-mode operation is a fundamental security mechanism in modern operating systems that provides two distinct execution modes: user mode and kernel mode. This separation ensures system stability by preventing user applications from directly accessing critical system resources and executing privileged instructions. Dual-Mode Operation User Mode Mode bit = 1 • Limited privileges • User applications Kernel Mode Mode bit = 0 • Full ... Read More
If you're using CentOS or RHEL (Red Hat Enterprise Linux), knowing your system version is essential for package management, troubleshooting, and security updates. There are several reliable methods to determine which version you're running. This article covers four effective methods to check your CentOS or RHEL version, each with step-by-step instructions and example outputs. Method 1: Check /etc/redhat-release File The /etc/redhat-release file contains version information about your CentOS or RHEL system, including the release number and update level. This is the most straightforward method. To check the contents of the /etc/redhat-release file: cat /etc/redhat-release ... Read More
The mv (move) command is used to move one or more files or directories from one location to another in Linux/Unix systems. Unlike copying, the mv command transfers files by removing them from the source and placing them at the destination. The mv command also serves as a rename tool when moving files within the same directory. Syntax The general syntax of the mv command follows these patterns − mv [OPTION]... [-T] SOURCE DESTINATION mv [OPTION]... SOURCE... DIRECTORY mv [OPTION]... -t DIRECTORY SOURCE... Command Options Option Description ... Read More
Docker provides comprehensive commands to manage Docker objects including images, containers, volumes, and networks. When working with Docker extensively, you may accumulate numerous images on your system. Listing and managing these images efficiently becomes crucial for system organization and resource management. This article explores various methods to list Docker images using different commands and options to filter, format, and display image information according to your specific requirements. Basic Docker Image Listing Commands Docker provides two primary commands for listing images, both yielding identical results: docker image ls [OPTIONS] [REPOSITORY[:TAG]] docker images [OPTIONS] ... Read More
Real-time embedded systems are specialized computing systems that combine the strict timing requirements of real-time systems with the dedicated functionality of embedded systems. These systems must respond to external events within specific time constraints while performing dedicated tasks within larger systems. A real-time system operates under strict time constraints and provides worst-case time estimates for critical operations. An embedded system provides specific functionality within a larger system. When these two concepts merge, we get a real-time embedded system that must meet both timing deadlines and perform specialized tasks reliably. Types of Real-Time Embedded Systems Real-time embedded systems ... Read More
Executing multiple commands in the background is a powerful feature in Linux that allows users to run tasks simultaneously without blocking the terminal. This capability is essential when working with long-running processes, system administration tasks, or when you need to maintain productivity while commands execute. Linux provides several methods to run commands in the background, primarily using the & operator and the nohup command. Understanding these tools and their proper usage is crucial for effective system management. Running Commands in Background Using "&" Operator The & operator is the simplest way to run commands in the background. ... Read More